diff --git a/.buildkite/test_areas/disaggregated.yaml b/.buildkite/test_areas/disaggregated.yaml
index 5ab0e836eb..226d7ac94a 100644
--- a/.buildkite/test_areas/disaggregated.yaml
+++ b/.buildkite/test_areas/disaggregated.yaml
@@ -287,6 +287,7 @@ steps:
     PREFILL_BLOCK_SIZE: "256"
     DECODE_BLOCK_SIZE: "256"
     MODEL_NAMES: "deepseek-ai/DeepSeek-V4-Flash"
+    VLLM_ENGINE_READY_TIMEOUT_S: "900"
     VLLM_SERVE_EXTRA_ARGS: "--trust-remote-code,--kv-cache-dtype,fp8"
     # The V4 indexer only supports block-outermost layouts; let it pick.
     PREFILLER_KV_LAYOUT: ""